Implement request id in PaymentDetailsInit

third_party/WebKit/Source/modules/payments/PaymentRequest.cpp

Index: third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
diff --git a/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp b/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
index 63e221476b9c5d4619f63e40ddda08f1023310d6..e28ca800e0a2669d750bc5c61dc735cd8ba06b27 100644
--- a/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
+++ b/third_party/WebKit/Source/modules/payments/PaymentRequest.cpp
@@ -39,6 +39,7 @@
 #include "modules/payments/PaymentsValidators.h"
 #include "mojo/public/cpp/bindings/interface_request.h"
 #include "platform/RuntimeEnabledFeatures.h"
+#include "platform/UUID.h"
 #include "platform/mojo/MojoHelper.h"
 #include "public/platform/InterfaceProvider.h"
 #include "public/platform/Platform.h"
@@ -521,6 +522,9 @@ void validateAndConvertPaymentDetailsInit(const PaymentDetailsInit& input,
     return;
   }
 
+  if (input.id().isEmpty())
+    output->id = createCanonicalUUIDString();
+
   validateAndConvertTotal(input.total(), output->total, exceptionState);
 }
 
@@ -883,6 +887,8 @@ PaymentRequest::PaymentRequest(ExecutionContext* executionContext,
   if (exceptionState.hadException())
     return;
 
+  m_id = validatedDetails->id;
+
   if (m_options.requestShipping())
     m_shippingType = getValidShippingType(m_options.shippingType());